Sara García Alonso (León, 1989) is a Spanish cancer researcher and reserve astronaut in the European Astronaut Corps (promotion of 2022). She holds a PhD cum laude in molecular biology of cancer and translational medicine and has been awarded with several prizes for her academic excellence. She works at the Spanish National Cancer Research Centre (CNIO) as a research scientist leading a project on experimental oncology and drug discovery in the laboratory of Mariano Barbacid. Sara is also active in volunteer work, has given numerous talks and scientific dissemination presentations for the general public, and motivates young people to pursue STEM careers. For all her social work she has received several awards and distinctions.